Richard W.M. Jones
2018-Feb-02 11:52 UTC
Re: [Libguestfs] [ovirt-users] Slow conversion from VMware in 4.1
On Fri, Feb 02, 2018 at 12:20:14PM +0100, Luca 'remix_tj' Lorenzetto wrote:> Hello Richard, > > unfortunately upgrading virt-v2v is not an option. Would be nice, but > integration with vdsm is not yet ready for that options. > > On Thu, Jan 25, 2018 at 11:06 AM, Richard W.M. Jones <rjones@redhat.com> wrote: > [cut] > > I don't know why it slowed down, but I'm pretty sure it's got nothing > > to do with the version of oVirt/RHV. Especially in the initial phase > > where it's virt-v2v reading the guest from vCenter. Something must > > have changed or be different in the test and production environments. > > > > > Are you converting the same guests? virt-v2v is data-driven, so > > different guests require different operations, and those can take > > different amount of time to run. > > > > I'm not migrating the same guests, i'm migrating different guest, but > most of them share the same os baseline. > Most of these vms are from the same RHEL 7 template and have little > data difference (few gigs). > > Do you know which is the performance impact on vcenter? I'd like to > tune as best as possible the vcenter to improve the migration time.There is a section about this in the virt-v2v man page. I'm on a train at the moment but you should be able to find it. Try to run many conversions, at least 4 or 8 would be good places to start.> We have to migrate ~300 guests, and our maintenance window is very > short. We don't want continue the migration for months.SSH or VDDK method would be far faster but if you can't upgrade you're stuck with https to vCenter. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into KVM guests. http://libguestfs.org/virt-v2v
Luca 'remix_tj' Lorenzetto
2018-Feb-05 21:57 UTC
Re: [Libguestfs] [ovirt-users] Slow conversion from VMware in 4.1
On Fri, Feb 2, 2018 at 12:52 PM, Richard W.M. Jones <rjones@redhat.com> wrote:> There is a section about this in the virt-v2v man page. I'm on > a train at the moment but you should be able to find it. Try to > run many conversions, at least 4 or 8 would be good places to start.Hello Richard, read the man but found nothing explicit about resource usage. Anyway, digging on our setup i found out that vcenter when on low cpu usage is 95%. I think our windows admins should take care of this. Luca -- "E' assurdo impiegare gli uomini di intelligenza eccellente per fare calcoli che potrebbero essere affidati a chiunque se si usassero delle macchine" Gottfried Wilhelm von Leibnitz, Filosofo e Matematico (1646-1716) "Internet è la più grande biblioteca del mondo. Ma il problema è che i libri sono tutti sparsi sul pavimento" John Allen Paulos, Matematico (1945-vivente) Luca 'remix_tj' Lorenzetto, http://www.remixtj.net , <lorenzetto.luca@gmail.com>
Richard W.M. Jones
2018-Feb-05 22:13 UTC
Re: [Libguestfs] [ovirt-users] Slow conversion from VMware in 4.1
On Mon, Feb 05, 2018 at 10:57:58PM +0100, Luca 'remix_tj' Lorenzetto wrote:> On Fri, Feb 2, 2018 at 12:52 PM, Richard W.M. Jones <rjones@redhat.com> wrote: > > There is a section about this in the virt-v2v man page. I'm on > > a train at the moment but you should be able to find it. Try to > > run many conversions, at least 4 or 8 would be good places to start. > > Hello Richard, > > read the man but found nothing explicit about resource usage. Anyway, > digging on our setup i found out that vcenter when on low cpu usage is > 95%. > I think our windows admins should take care of this.http://libguestfs.org/virt-v2v.1.html#vmware-vcenter-resources You should be able to run multiple conversions in parallel to improve throughput. The only long-term solution is to use a different method such as VMX over SSH. vCenter is just fundamentally bad. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW
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- Re: [ovirt-users] Slow conversion from VMware in 4.1
- Re: [ovirt-users] Slow conversion from VMware in 4.1
- Re: [ovirt-users] Slow conversion from VMware in 4.1
- Re: [ovirt-users] Slow conversion from VMware in 4.1
- Re: [ovirt-users] Slow conversion from VMware in 4.1